Officials at the Centers for Disease Control report that the country is suffering from a Whooping Cough epidemic.
And health department officials in this state are not exactly sure why Arizona has the 11th highest incidence in the country.
Nationally, health officials say the country is on track to have the worst year for whooping cough, or pertussis, since the late 50s.
Nearly 18 thousand cases have been reported nationally so far this year.
That's more than twice the number reported at this time last year.